SQLSTATE [HY000] [2002]连接被拒绝 - 引起：PDOException

I have the following settings in config/db.php:

return [
    'class' => 'yii\db\Connection'
    'dsn' => 'mysql:host=myURL;dbname=mydb', 
    'username' => 'mydbUsername',
    'password' => 'mydbPassword',
    'charset' => 'utf8',
];

That above string works in my test-machine, however in the server where I deployed the app does not work.

What is wrong? Thanks.

host=myURL ?? try host=localhost

Unless you are using a different machine for the mysql server, but I guess you are not.

If you have different host name, then try chaning host name. But i think the connection is refused because, you are trying to access your mysql server with different port number.

Try with this:

 mysql:host=hostName;dbname=dbName;port=portNumber;